Electric heating



April 14, 1953' 5. J. TEMPLE 2,635,163

ELECTRIC HEATING Filed Dec. 50, 1950 3! SIDNEY J. TEMPLE Fl 9 INVENTORATTORNEY Patented Apr. 14, 1953 um'r so sures PATENT OFFICE.

, ELECTRIC IiEATlNG Sidney J; Temple, Pittsburgh, Pa.-, assignor toEdwin L; Wiegand Company, Pittsburgh, Paw, a corporation of PennsylvaniaApplication member so, 1950, Serial No. 203,691

My invention relates to electric heating, and me principal object of myinvention is to provide an electric heating device having im rovedterminal means.

In the drawing accompanying this specification and forming a part ofthis appueauon I have shown for purposes of illustration two embodimentsof my invention, and in these drawings Figure 1 is a general view or theone embodiment;

Figures 2 through 8 are views illustrating one method of construction;and

to the sheath ll, but stopped short of the ends a of the sheath ll, thusproviding recesses I5 at the eiiii's of the element. 7

.As herein shown the element I is bent on itself, so that the two endsof the sheath 'H are adjacent and open in approximately the samedirection, and suitably the refractory rn'at'erial T4 may be granularmagnesium oxide formed by fusing and then crushing and screening tolimit to an appropriate range of particle size.

Further the embodiment of Figure 1 comprises two conductor means 20,each including a conductor 2| butt-welded to the end of the respectiveterminal pin l3, as indicated at 22, and an electrical insulatingcovering 23 extending over the connection 22 and within the respectiveend recess l and held against displacement by the wall of the sheath l Ibeing crimped inwardly into the covering 23, as indicated at 24.

According to the present disclosure the conductor means are assembledwith the element Ill as indicated in Figures 2 through 8, in whichFigure 2 indicates one end portion of the element l0 and Figure 3indicates one end portion of one of the conductor means 20 in itsinitial condition.

Under the illustrated method, first the insulating covering 23 isretracted, as shown in Figure 4, exposing an end portion 25 of theconductor 2| of a length approximately equal to the extent of theterminal pin l3 beyond the face of the refractory material l4, and alsoa next adjacent portion 26 of a length suitable to permit the subsequentwelding operation;

Next the end portion 25 is removed, as indicated in Figure 5, and thenthe end of the adjacent portion 2'6 is butt-welded to the end of theterminal pin B, as indicated in Figure 6, and thereupon the insulatingcovering 23 is caused or permitted to resume its original relation, andthereby comes into the position indicated in Figure 7, extending overthe welded connection 22, within the end recess 15, and into engagementwith the face of the refractory material 14.

According to the present embodiment, the wall of the sheath II is thencrimped inwardly at 24, to retain the covering 23 in position, therebyproviding the construction shown in Figures '1 and 8.

The embodiment illustrated in Figure 9 cmploys a two conductor cable 30provided with single conductor extensions 3| corresponding to theconductor means 20 of the .previous embodiment and applicable in thesame manner.

From the foregoing it will be apparent that the described embodimentsafford various advantages, including a completely covered coirnection, arelatively tight closure, low cost, and

easy application,

on the other hand, obviously various changes may be made, and otherembodiments constructed, retaining all or part of the presentadvantages, and therefore it is to be understood that the presentdis-closure is illustrative only, and that my invention is not to beregarded as limited thereto, but to be of the scope defined by theappended claims.

Wherefore I claim:

1. The method of extending the terminal and closing the terminal openingof a sheathed embedded resistor electric heater wherein a resistanceconductor is disposed in a sheath and has a terminal end accessiblethrough the opening in the sheath, and wherein the resistance conductoris embedded in an electric insulating heat conducting refractorymaterial which terminates short of the opening in the sheath to formwith the sheath a pocket, which comprises retracting the insulatingcovering from the end of an electrical conductor having a mobileinsulating covering thereon to expose the end of said conductor.connecting the exposed end of said conductor to said resistanceconductor terminal, returning said retracted electrical conductorinsulating covering to a degree sufiicient to cover the exposed end ofthe electrical conductor and the accessible end of the resistorterminal, and into a position wherein the insulating covering isdisposed in and substantially fills the pocket in the sheath. and thendeforming that portion of the sheath forming the pocket to therebyproduce a tight sealing engagement of the insulating covering with theinternal walls of the sheath forming the pocket. i

2. The method of extending the terminal and closing the terminal openingof a sheathed embedded resistor electric heater wherein a resistanceconductor is disposed in a sheath and has a terminal end accessiblethrough the opening in the sheath, and wherein the resistance conductoris embedded in an electric insulating heat conducting refractorymaterial which terminates short of the opening in the sheath to formwith the sheath a pocket, which comprises retracting the insulatingcovering from the end of an electrical conductor having a mobileinsulating covering thereon to expose the end of said conductor,severing from the exposed end of said electrical conductor a lengthapproximately equal to the length of the available end of the resistanceconductor, connecting the exposed end of said conductor to saidresistance conductor terminal,

returning said retracted electrical conductor insulating covering to adegree sufficient to cover the exposed end of the electrical conductorand the accessible end of the resistor terminal, and into a positionwherein the insulating covering is disposed in and substantially fillsthe pocket in the sheath, and then deforming that portion of the sheathforming the pocket to thereby produce a tight sealing engagement of theinsulatingcovering with the internal walls of the sheath forming thepocket.

3. The method of extendin the terminal and closing the terminal openingof a sheathed embedded resistor electric heater wherein a resistanceconductor is disposed in a sheath and has a terminal end accessiblethrough the opening in the sheath, and wherein the resistance conductoris embedded in an electric insulating heat conducting refractorymaterial which terminates short of the opening in the sheath to formwith the sheath a pocket, which comprises retracting the insulatingcovering from the end of an electrical conductor having a mobiledeformable insulating covering thereon to expose the end of saidconductor, connecting the exposed end of said conductor to saidresistance conductor terminal, returning said retracted electricalconductor insulating covering to a degree suflicient to cover theexposed end of the electrical conductor and the accessible end of theresistor terminal, and into a position wherein the insulating coveringis disposed in and substantially fills the pocket in the sheath, andthen deformin that portion of the sheath forming the pocket to therebyproduce a tight sealing engagement of the insulating covering with theinternal walls of the sheath forming the pocket and the externaldiameter of the available end of the resistance conductor.

4. The method of extending the terminal and closing the opening of asheathed resistor-type electric heater having a terminal end of theresistor accessible from the sheath opening, which comprises retractingthe insulating cover from an end of an electrical conductor having amobile insulating covering thereon so asto expose a length of theconductor, electrically connecting such exposed length to the terminalend of the resistor, returning the retracted insulating covering andconnecting it to the sheath of the heater to cover the electricalconnection and to close the sheath opening.

5. The method of extending the terminal and closing the opening of asheathed resistor-type electric heater having a terminal end of theresistor accessible from the sheath opening, which comprises retractinthe insulating cover from an end of an electrical conductor having amobile insulating covering thereon so as to expose a length of theconductor, electrically connecting such exposed length to the terminalend of the resistor, returning the retracted insulating coverin andmechanically connecting it to the sheath of the heater to cover theelectrical connection and to close the sheath opening.

SIDNEY J. TEMPLE,

References Cited inthe file of this patent UNITED STATES PATENTS NumberName Date 1,973,271 Smith Sept. 11, 1934 2,053,933 Abbott Sept. 8, 19362,662,886 Jensen Dec. 1, 1936 2,423,290 Bonwltt July 1, 1947 2,455,102Temple Nov. 30, 1948

